Is it okay to use the film provided by the 4S shop? How's the quality?

You can stick it on, anyway it's free, so the quality is definitely not good. But for car owners who bought an Eado, don't worry about that. If you're willing to spend 2000 yuan, go to the official flagship store of a top international brand and buy their mainstream products. They offer free installation offline, and it's a completely different experience. If you're not willing to spend that much, then just honestly use the ones from the 4S store.

The film that comes with it and the one you buy separately are different. The one that comes with it is okay for the first couple of years, but you might want to replace it later on.

Generally, it's up to you. It's recommended not to stick in the front row, you'll regret it if you do.

Outside costs money, while the 4S shop is life-draining.